docs: def is_available(self, fname):
          """
          Check availability of a remote file without downloading it.
  
          Use this method when working with large files to check if they are available for
          download.
  
          Parameters
          ----------
          fname : str
              The file name (relative to the *base_url* of the remote data storage) to
              fetch from the local storage.
  
          Returns
          -------
          status : bool
              True if the file is available for download. False otherwise.
  
          """
          self._assert_file_in_registry(fname)
          source = self.get_url(fname)
          response = requests.head(source, allow_redirects=True)
          return bool(response.status_code == 200)